The X3 combines the utility of a crossover with the sophistication and driving fun of one of our favorite sedans: the legendary 3-series. There are three turbocharged engines—a 240-hp 2.0-liter four; a 300-hp, 3.0-liter six; and a 180-hp, 2.0-liter diesel four, which offers improved economy but less refinement. An eight-speed automatic is standard; all but the base rear-drive X3 have xDrive.